More than 70% of online adults in the US use Facebook. The runners-up, LinkedIn and Pinterest, were tied at 28% — way behind.

They were followed by Instagram at 26%, and Twitter at 23%.

Although the percentage of Facebook users didn't increase from last year, users became more engaged with the site than they used to be. Now 70% of Facebook users visit the site daily, versus 63% in 2013.

In contrast, less than half of Instagram users (49%) visit the site daily, and only 36% of Twitter users, 17% of Pinterest users, and 13% of LinkedIn users check each of those sites every day. (Twitter disputed Pew's data. Twitter's measurements show that 48% of monthly active users in its top 20 markets use the site daily, and the US is its most engaged market.)